First-order CP phase transition in two-flavor QCD at θ=π under electromagnetic scale anomaly via a Nambu–Jona-Lasinio description

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-04-22 DOI:10.1103/physrevd.111.074028

Yuanyuan Wang, Shinya Matsuzaki, Mamiya Kawaguchi, Akio Tomiya

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引用次数: 0

Abstract

We discuss the thermal CP phase transition in QCD at θ=π under a weak magnetic field background, where the electromagnetic scale anomaly gets significant. To be explicit, we work on a two-flavor Nambu–Jona-Lasinio model at θ=π in the mean field approximation, including the electromagnetic-scale anomaly term. We find that the thermal CP phase transition becomes first order and the strength of the first order gets more prominent as the magnetic field increases. The associated potential barrier is thermally created by the electromagnetic scale anomaly and gives rise to criticality due to the induced potential of a nonperturbative form ∼|eB|3fπ|P|P2+m02, where eB denotes the magnetic field strength; P is the CP-order parameter, and m0 is the isospin-symmetric current-quark mass.

Published by the American Physical Society

2025

查看原文本刊更多论文

基于Nambu-Jona-Lasinio描述的两味QCD在θ=π处的一阶CP相变

在弱磁场背景下，讨论了QCD在θ=π处的热CP相变，此时电磁尺度异常显著。为了明确起见，我们研究了平均场近似中θ=π处的双味Nambu-Jona-Lasinio模型，包括电磁尺度异常项。我们发现，随着磁场的增大，热CP相变变为一阶相变，一阶相变强度也越来越明显。相关势垒是由电磁尺度异常热产生的，并由于非扰动形式的感应势而产生临界态，即~ |eB|3fπ|P|P2+m02，其中eB表示磁场强度；P为cp阶参数，m0为同位旋对称电流夸克质量。2025年由美国物理学会出版

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.